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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '43bf1ce1a1a69a34b3681c1607cef74ed249a876aa1e1b8a1bd1695d5fb76bac' 
  AND token = 'xJC/F7TFC6vDgTd/4TGO3v6RB2yveB1msedD1fSunW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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