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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09b86f4e94dc433eddbc21c9353ab6df7c65c72e5d1e0c1f7f26f74932fc97eb' 
  AND token = 'a7z9H0el9YDSb3SEXj9x1FGPiRmzh0PLxji9btqu0nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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