Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7517effb001d52c93b034fad4df5d967af47cfe0d1452c671b3f1d62782fd04' 
  AND token = 'ev1APbUwQtVPxuPJ8EuFIE6MHwKi2epPMmkMxnQGUE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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