Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b20256055a72d0416c6771985318372f670a96d29118ba37c1b0b66da12cdc' 
  AND token = 'N50Apy0awW1DsA2zapO2yXFUEvrYXrlm+7n11vnwnLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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