Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8b3f1c18b07ab4be3b378358cb36f37b649bacae1640c8040dad65af91ed6c' 
  AND token = 'wg30eLOvsf3IRwZdy96o6s0iDMMmi6PMXDDVi3Yqhc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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