Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14c2e86f199406da870421d84383d0b61234d300e41ad9e243aac353b07116af' 
  AND token = 'iuO/slW9hYqUUTS+cJfr6xVIKfO/DcE+t/4M+YU2FfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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