Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3c11f8a98cde893caa4c093d13c847c8106768cb0d1d6b68c1ef84b9fed31daa' 
  AND token = 'cXqGg+CbVKZhV81X0j+tYRL2BOE4uSrtADGHi6WMBg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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