Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db7beedfa3b44760d96d15d14de15afac925da2c24f4acc163917ed36856629' 
  AND token = 'n5J/DtTHxMqnFbEiUjaudL0mKS0lxbFlSYEC4h5olq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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