Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de6720bc2e22dd61dfef0d451588b574fd7cf38a1996d5513047b907eaaaac83' 
  AND token = 'yyX9WO/wOFdI1fcBWJpLXyE0Vnt5fyTWbh1ctfCzF9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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