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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a5da57a39c2af418b4284f7521bb2ffb714457a71813dfd84274f147cca2ca45' 
  AND token = 'P76RnTngBXG55FgcbnT9Z3ineuhXt/AMKF/ZwlPh/8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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