Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8b5140749dfbc6c97bfbb43c4b45f1f3c0a8f4ca8c20bcb880282246654d973' 
  AND token = 'adBvqAIfbd6suCx/FBi0oumOOnFsaPn6SOXTzx+FtKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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