Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4a26eccd547a8ffd8c680d52592d59377076b106648ac3368d22b74349ab2c' 
  AND token = '10a1rfrOban7QoOyTpe9REcCs0sncNQRXIyJ4y+mh8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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