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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0a85921ac10bc7110874731d524a88aa817a2bc160c52bf5e1c68c9ec1cce112' 
  AND token = 'ceYnML1fvXe3YTV3HTtMmaTM9zFGUqOZ+6ZwnzO19WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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