Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '26d0e6209aca38963b954791b0ef2199148d2bb37eee80fd5fdafebac160f36f' 
  AND token = '0l9winLYQ96aX7NzoNmK8yhUnBcoO1LN4h/DNbPCaC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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