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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85be3d8b0fe3e76cf3cbed65ffe4927597531eb5d624316a5ee61dc237915b2c' 
  AND token = 'ZvzzL0PcEY4xTFPjRT0ltvaZNMHANNxr0G+UjizO19A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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