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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6bd55988bfdc349e48bc580fcdb4233450c01522d538f6d94fed83cdb2cc320d' 
  AND token = 'DUxbRVClgOLv14oTip5DdkQd6J+xQWg9P03mbyD0YeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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