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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1a72830dd1d41e1e8f2fab929abfebf6c6e4c5c26785877434f4c5ed8b59abf3' 
  AND token = 'emNZlgAPKFpI9u/qldjEqP/MhoiMoNtO/UdjsILKFa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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