Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25efdb348d0b056ec3f2d0468f1cc64a88c9a1fa4bcc9c4fc5f2fd4bd92d43ac' 
  AND token = 'mGnuwcgreCfocb1AhhQChOJ+G66mrcdReskZ6V9CnCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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