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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'cdc79f18cbdc699812ac48a0888fcb6ca5af0e690e4e06e2bb43b4f0fd67d9a6' 
  AND token = 'IgMEfQ5XrENnTcmB3lrMl0cqL1ZKqisF+RNjTGVLl9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}