Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15437e8e433b9d04e8fccd552b4a1cc2dda6b616ee006c189b8c58dfb8162b41' 
  AND token = 'OSXdY8ngNx77dZ3H+HAHZF+tAHh+ixXBoHOzPC50Plw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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