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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ee4ce170e14f6bf246bd524997028f614e8db1a6e738aae6a3b91ad274890444' 
  AND token = '2GiNxxmMdiob9WARCquoFuB8mlDtbg5C6amBvmTs8aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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