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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '96221e378f80cd2c2884c5486d289960bfb8009972e7da916a8782f110b7bb8f' 
  AND token = 'RJth8b6tjfnWn4ZFyJryKGhlYX0MBf2TeOHTFAwz9pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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