Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4551efd5aea15a450212e6b687f08d44382aa2674ab2874fbb2c9478df6d4582' 
  AND token = 'fNUV8ScCqJVVdrOUDYqlnuQ81qs87AKExsOkm90mRYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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