Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdf4c52a0ebedf6f57096274cf2251faa1e5e8a798e372a95d9e3c53a40cddd' 
  AND token = 'vQqMbgJbDbr8n2USs1UGvhZOo5hbhftYV8wODb6Q9Bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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