Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0c71ea87233b2ee6b310f7df9fb68771016df707c3025062a6b683db7916b4' 
  AND token = 'nbXBjDqfzHAb6JDnW2ZRo9xt3TUFgje+4SBvDJmuUkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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