SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '534230b1426824bff9ccce5c756c10fe97499f5ed6a71a380d2c6820947fe309' 
  AND token = 'FT0ogvqRsC7B8TAj/91Rrg3ryPgucD+XUy6xBvIxYmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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