Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6901ba1f994dcb6e8e3cd2c70d25e5228db2130d838d7a7662a11320bc44e3ae' 
  AND token = 'hRYsqtknPhQ9WR1mXdB+GVnmRRTQpPCwI3yfiZrXjS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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