Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c22086ba81088dadc3feca85e87118aaad8ffbb04c30cb18078c1bed4beac5c' 
  AND token = 'vSfWoOBJ9R5DFGb/MTf8Uh+H6ECnRmLDjCnKxGNQNOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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