Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '25c72aa0598d4b8abc5a2a4aa8722646f1192f8bcd41c77fea040b3981204da5' 
  AND token = 'fo6gkSgDh8coiIF1mKWtd1Xu9zYLHsBfq9da7Dca3fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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