Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f51abf9900483a44bf36e2744e49cb0f30277f23373467222768b48b7c330a4' 
  AND token = 'CFMILKMb9HwemlgfU+Oe8ejpAORhF59vVFBxryH8oxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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