Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b81d489c9331e236ee14f271d0e4300eb0ba4751e76d90707c8098d8f09ac0' 
  AND token = 'qI/mePMn29t9FN7WElfIgCSIPzMWwtG3EqxqIDVTkpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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