SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e61b94f5aa32e9c9f22af551739b64b94d4cb117a5ffdc7cf95d4a8de71c261' 
  AND token = 'TXljs0J9nU5mUW9Rhxd6x2TLG+uMX9G3FqrABQBQl8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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