Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2325b2c79760ffaafabeeeda6c781103c3bcb7226819e592f4b5a2e27a152fef' 
  AND token = 'lLnHya8Ae/B7ZU+I/xlPXr6PPeiU5aeowMrYcnZsmQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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