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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '2d5d26f3b3c777f49035e43ecc2112c0f95322a2e34465999144c8311d774ab3' 
  AND token = 'a9NsZD26pe/Ev5RDoRNbnUozDUnakaFSVKmd06TDSZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00747

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}