Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6e6454f463bf851a551d8cf63e4d58bef71422e7aa8a4acdcad13f20964f2e' 
  AND token = 'E/xhy3JalUd4JoK5euVylX3T9ReIr8sB0/Bn+X7kPFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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