Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39e774449afc0a4a78466c3eadea028f8a281780c500f3423f58bfad80becee' 
  AND token = 'XMFXUbeKl/68hddd1ijSN4rVuchMWJEWtlDH8U3b8KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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