Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5227fa1be2b6f99268dbcd57ff87aa615eaa9dafbf06fbe295e2d3c3a7becd6d' 
  AND token = 'zvuYGOUUE+9T/fwGcaQGWgaPFIgvqZLMuFAv6y0hysE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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