Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542337cc8c4d0fdf784e5a1d72548eada9f4bda030d50bc95ffde3981550dccc' 
  AND token = 'pBr93SDQFYb/CrJ8YrrG2HSRyG8iLIb8RCcUWvyPhGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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