Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b4daddaccbc2b79c75b1c87b94ff743a2bcadadb41ebcdd656b378717f789c6' 
  AND token = 'c8sNjF+AHrkavHN8Q4aHbk0ZlYT2/3WvdBnCrtv7/wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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