Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57cc1669a54fc7426a79bd7319cbb970bbc9f63bf752d6dfec5aa92a6c6cdb5' 
  AND token = 'D0U+tezXVaRdIzAs1SjslASQSXvzZchFoHVvr8QObm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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