Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6615fef8b3b6cd352bb2bea6165235899319148c79c4e76fda2fb1cc8260bd72' 
  AND token = 'uDoG3kO6GdOjvZb64w391MfN+FMMRQXefn92fcBWic8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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