Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a59e61cd3826420b7d15fd51869ebc1812a5bb0424e434812dddf2155f9ed24' 
  AND token = 'GYRDfKW/Vx48ZsEcrFzyCjCtj0tJ9cju7lIIDr2D7yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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