Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11a75f9a21cd8a871ccb2930789316aa5ca64999371cddd931a72d1ed8a50c1' 
  AND token = '+5QiN3Br13YXn9KA1gTbfi0YoCBIljl5HAAGuJH9+Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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