Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f12562a837d2a589f07dd28535c7805a3453ac3a9ca4fb011716908d99ba372' 
  AND token = 'U/5V5GvoHiU79yim7MEHCwzIW1sBtGW8QcxMGegm2YM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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