Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55f41dc47e35157b6b8ad7d71201af0e0d859650e9fdf5eb43bb6e52da90a65' 
  AND token = 'Ps30CHCqAxSsPjAuZ4nl1fa04Uxs/LRAU+aUs2hNnoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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