SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd00a6cb3005b4478317256a4accf00b19720b20ba89d1657617fc48ae4924225' 
  AND token = 'mMFAlKnC10r7+A1vlv9gyBRG+0tLvJLKOrGw41Z0Lpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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