Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a98f5f1226dc6fd91a4aed98e89683d58b329efc629c5e15646ed7adce08aaa1' 
  AND token = 'B4dySvjrMSA7o8uM1bfL/qADs9N+mBA4SYb9iTbLpDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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