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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0696b0cf27e4b79af7d79ef520ee12e3bb44f9e9023b4b373af69acc390b5c0c' 
  AND token = 'toKp4eI07EJ4laVJUes9BqnRG2Vh/l5+06jDSoEwFbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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