Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121ba1798a383d8c8843260265c1d4ffa3daeede1257837081f6c9df1f582050' 
  AND token = '/eQGxmU7lw7bfbEBYs7lADXlK4/xUD5qVL1bt9anM5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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