Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d38b2fc4e9dc39d25c8c7e3ad7a7f50a88ceaa47a2aa00de05ad58c12aee1c' 
  AND token = 'u87vc5AYFF7WRn7xw6TI1U9DwMHj1wvy1qpTComQjls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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