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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea282cf942908173f5cab2e67ef10aaa1bb9f0ba3c34b5f9bf28a980cbf35647' 
  AND token = 'rVXm7iewIQWlvQ3iXrPEyPKPo08FdkNYyKgyU+jSTCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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