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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7a08460d8f39c32a978482c3529fac39e60e85a2a7cee9ec097c47a9b2739348' 
  AND token = 'AhOii/eL+rwFLD4Dhn+nZ0PhoNgE74dsFvn3uneN884=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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