Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ea2c91c2e84285edcacd7b03d5547c4f5bde6c58d1e79bfd67e5742f099b6b' 
  AND token = 'pwNeTmtTz8lDgrAVMiQpMZke28CSpRnhUQuUdKuofAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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