SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9c67de568b8e9ffdc0905f615ecbf9c0b818a88b9af4608bb61bf722d4e35444' 
  AND token = '0rYpr9UtzfZOpFQARlFwmzogmd5Ed/Aim70g7qgvzSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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