Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5a1bbb698c598ffc3f457e60493d6636ad7f5825a6e17b7e2211e2b82762019e' 
  AND token = 'kK6iphyENrKotYm6tRbWqJBu/foW1GWgjgiKsxkgKKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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