Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6e659e94b0b800d6c15438ee03fc8895fcf1ab471c019a10581427a0a5d309' 
  AND token = 'iYnglD91UQ7E3x9CBWnW5qA2OHu2o7uSYHX43AZmRcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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