Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec71e543a514cbfe805b303063d7aeb9f5d854b78ccc46b892294220451e0760' 
  AND token = 'f2tNr+vO/nn8UjmFaiTCQ9EHa6OOSjA990E+qTFJd7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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