Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5421cb6aab9d9279879fe280ef9f78b80593b468d614b605c3ac698dbafa45' 
  AND token = 'y9t1qtRCE/ZuWE8DLeAqhDG9qLovU+FLhsl5+2ySj78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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