Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac55cc58d36f41cafc0604453d856de44379e76ed3fa04af8feaa4ebe8f49dfa' 
  AND token = '+M5cVrRsSiBaN8CI9Ge1pq+o4XfOszg27rxsbd/UIbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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