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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '64e61fa0641bfc3f6b4b0053edab117fc9e05f60c93fce8ff170b6df984d9cbd' 
  AND token = '3awabShFknW27o0/Rhn+Q7Qqr58wfNUxAAyWLmv4aIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00776

JSON explain

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