Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d5a6262f292dafd10451b3593f25c6688adf807336f34cf9fc7805ac20f729' 
  AND token = 'eP8/aNnP/it4baBCBFpAb6Mb919+sQDbVFt5eIi+n5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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