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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd346c6f476b8fa0e4e486ab84f85692b81e23cfae5fbd9a70592fc76e1bf1ef1' 
  AND token = 'irU6C7iO5E10hdOO0oGnd/6dfVkpbKUtXv1ja6oeNrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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