Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908643e28ddf74b6003b175b49d9241974726097fad5311ab995690e874da001' 
  AND token = 'pmhRbq2smrPST+vc2NLOcJq8zpoq04WThnYEXzG6KFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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