Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b101d22f25fe7530fcec7089bd335ebc77b823445bd505dfcf7ae2b67c50b5' 
  AND token = 'MQN5FeL7xSEHQ4vwyHrrPKCOSFfJoDz4WRiVEgoMZOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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