Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b755509e0f23974a6325b69bebda124a7b8d4ec2008a8f1dc9e323d9feeaf1d' 
  AND token = 's9uvFCWPpu500jY0m/cjUyW9K9q9BWmf1GSgbAVyEdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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