Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac357663722b2c990e0f6ece8f3dc315c62bc95d1a2d55bc9bd256d04f16ee8d' 
  AND token = 'nexCFoKmWGXJGiaZ/SZzvd6LGc6mqi72tDN5Q9s5iac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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