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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e464ac51550efe3a8ca25b2131cd61088ad8d5afd06ffec72ca08d92892ae5fd' 
  AND token = '95wf4vU27znmLFgIMgH02CuEV79476oRtRkuTve6CoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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