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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0828d3e58f78a6c3f4c33c3357cc23888ed9d5f14f5ccc9f42f44a0205059a43' 
  AND token = 'mW3tvTwZEEkxsviy0nfL9SFI2LgdxwqHwxU4U1W8bxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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