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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '36ec89df1aafc67eb3086c2c497bbc5af8e67cde5ce8047f1d15a71a741d67c4' 
  AND token = '0iZ/sA0ThUnuZze7AmZED7K+xwCI4en8PzyPyaw0Y+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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