Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6a96785c9313e63aaa17048bd0e959f898971abf636fc3becd9c934f7b56b7' 
  AND token = '9jQvdqK7PRyyOesGEKOQ16CvA/h5EIjZly+Rb76MJaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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