Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '260aabb764c4d3003d4f0f5557ffea2ce19798b9bee01987930c0fdfaaf18263' 
  AND token = 'uqoV99pCOVWlN0QpPxnuux/uoR7zOapTLfYOpMBBLc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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