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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6b8f8d100f28b356a0f0d66bcfd403193ed4a4e825ee1abbc95362aea99eb976' 
  AND token = 'ok2NP2UeabuctbnqwiYcouKeBmGcmAE7kw0cCGNywKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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