Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b519775a51b8b1fdaa24ed9c12d5e92a97a8d2e0d356fc184846a69fb1791611' 
  AND token = 'EVynLcommr4o1ffmD9WYTOHE8JePaCcgImYujC0sF+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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