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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '705110ee3110b11e4ffecafce3c4048da3ec6531459ba59493b6c965847b6060' 
  AND token = 'RvUS3aD0eOfsNgAm7Ke//W0e75pe6IXUU4yT2DxZBgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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