Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad4ad6142f9c10861a8276a8d580abbb8f643301bc38897ff32646cb95ddd78' 
  AND token = 'QkB04GXrbEbWqr2kdvB+yCDBMBMSHjDVVKuuvY58PfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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