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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '988150f43149aff7bbaca113f385638ff59e216e0236213839e23dede6949f24' 
  AND token = '3LfRbYr5RmdPAJKPuuNmbk4OH+M478uz0WFwpZkvAtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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