Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37078bad12d9acf86a17e260fc4a2e5635e91feb03a5aa9eb6eca4872722015' 
  AND token = 'YfG8LzzJrxtqDxDSZFHRWCJUcS1inXlrqtVY0GbDrZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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