Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ecc624789462c2f8e75986e0040c52bc47eb2062bd343212a3b8db4a3b2983c' 
  AND token = 'aDnaEHLNGWyOd3ubLqr0zp8Uiuvsnoo/CyEHFjTHYR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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