SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '97a4f9934a77d7744f2c58d6f3aa1f63bc56e92a15791e8f1c6b568c23d67672' 
  AND token = 'QBcGmHYByS4xJInCGqijnMZ46Hv1wdUKrIm30C24GqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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