Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdf7837a0e91e6ea856f6f2656048f69a12edbf8551aff0d14376bc0d810e70' 
  AND token = 'lSJkgoHtnuN+elyqbijVbqWB0rD3CUXj6bQpVyU3KYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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