Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9deae9481377c1f1ab391d19cba052a66e9de53343710f387ffa20febef3644a' 
  AND token = 'rgzAwe36HyvW4tklaggJWZItaYxhYMwAwwrfGWvu7e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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