Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c71cad7d032e32adae941f4ffe47e75250f55a81ed4c80047018264df0d92a3' 
  AND token = 'sC1Xy6bseZBDykHtYOIKspPPd4j/Z2/JqInSFNmXbIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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