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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '390e0629a9ac4f07ee511c40b9a2310bdeeccb4160b9fc95800b02a61f2a88b8' 
  AND token = 'zz75eEGRsnphmWVfsDWB/y3V9Ncf+F/Bg7V0O3yAuxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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