Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f08b17f7ee7897e5b4c4dbd426e278ec4d8dbc39feb8b1d1622fe971f03d8b6' 
  AND token = '6Wg40dxAQ58ABavTqFOavk2m2HH6nwv44pk5v3ECREU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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