Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376df1d0313810e3e09a622de843d63a5a4a7266b37e776e951dd0ff5708e57d' 
  AND token = 'yQjT78eqcXlB2Y3IyCLX7neaSiDsNl3izS643mJof8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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