Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e7a15b21c524b8c79aaf966fa2be78614449a58d9337cca2e2b9f71102617e' 
  AND token = 'Z8S7z/+QPf2cudXydpcTNUHjWz9NTLx5v486vOfjM1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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